/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/RigVMController.h
Opens an undo bracket / scoped transaction for a series of actions to be performed as one step on the Undo stack. This is primarily useful for Python. This causes a UndoBracketOpened modified event.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=RigVMController) bool OpenUndoBracket ( const [FString](API\Runtime\Core\Containers\FString) & InTitle )